The British almanac of the Society for the Diffusion of Useful Knowledge, for the year of our Lord 1848 being bissextile, or leap year. The Companion to the almanac, or, Year-book of general information for 1848. The twenty-first year : containing, I. general information on subjects of mathematics, natural history, and philosophy, chronology, geography, statistics, &c. II. the legislation, statistics, public improvements, and chronicle of 1847.